Spiralock Corporation

The Spiralock-brand preload locking internal (female) thread form that is designed to be exceptionally resistant to transverse vibration, the primary cause of thread loosening.
The threaded holes and nuts accept standard male fasteners, eliminate the need for other locking devices and substantially reduce the potential for fatigue failure when compared to standard threads.

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As Seen In CompositesWorld

Locking fasteners - 4/1/2008
Spiralock Corp. (Madison Heights, Mich.) has introduced new Drive Notch (DN) wire thread inserts that reportedly show no loss of tension after 24 hours of continuous vibration testing (1 million cycles) and no indication of fatigue problems. Aided by the Drive Notch installation tool, the inserts simply thread into

Locking Fasteners
Spiralock Corp. (Madison Heights, Mich.) has introduced new Drive Notch (DN) wire thread inserts that reportedly show no loss of tension after 24 hours of continuous vibration testing (1 million cycles) and no indication of fatigue problems. Using the Drive Notch installation tool, the inserts simply thread into any